ISO 25761:2014 pdf free

/FREESPACE2ULSTANDARDSPDF/ISO/ISO-25761-2014.rar
One way of preparing the 0,10 mol/l perchloric acid in acetic acid is as follows. Ina 1 000 ml volumetric flask, mix 8,7 ml of perchloric acid (8.3) with 500 ml of glacial acetic acid (8.1). Add 25 ml of acetic anhydride (8.2) and dilute to volume with glacial acetic acid.
WARNING – Perchloric acid is extremely irritating to the skin, eyes and mucous membranes,highly toxic via oral and inhalation routes, and can form explosive mixtures when mixed with carbonaceous material or allowed to dry. Concentrated perchloric acid should only be used in a hood approved for perchloric acid use. Chemically resistant gloves should be worn. In the event of skin contact, wash with soap and water. Goggles or safety glasses with side shields should be worn. In the event of eye contact, flush with copious amounts of water for 15 min. In the event of inhalation, move the victim to an uncontaminated area. In the event of ingestion, do not induce vomiting. For all exposures, seek professional medical advice.
It is strongly recommended that reference articles on perchloric acid safety be consulted to determine safe-handling and clean-up procedures (see References [1] to [6] and references cited therein).
Under normal circumstances, the blank value is negligibly small and is not included in the calculation. However, a solvent blank should preferably be evaluated at suitable intervals to confirm that the solvent blank is indeed a negligible value.
NOTE Some laboratories report using this general procedure for lower levels of basicity, employing 0,01 mol/l perchloric acid as the titrant. Better results are reported at low levels with a colorimetric end point determination.
No blank is needed since the solvent is neutralized to a green end point before the test solution is added. Precision data reported in this International Standard are based on the range 0,3 % to 10 % nitrogen. Precision data at lower ranges of nitrogen are not available at the current time. Therefore, precision studies will be necessary before the method is applied to ranges below 0,3 % nitrogen.ISO 25761 pdf free download.